#tb1 th { padding: 5px; }
#tb1 td { padding: 5px; }

.gvt { border: 2px solid gray; border-collapse: collapse; }
.gvt td { border: 1px solid black; }
.gvt td input { width: 22px; padding: 0 0 0 2px; }

#tb2 th { padding: 5px; }
#tb2 td { padding: 5px; }

.grid { height: 700px; }